Academic Journal
Dyke-impounded fresh groundwater resources in coastal and island volcanic aquifers: Learning from the Canary Islands (Spain)
| العنوان: | Dyke-impounded fresh groundwater resources in coastal and island volcanic aquifers: Learning from the Canary Islands (Spain) |
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| المؤلفون: | Marazuela, Miguel Ángel, Baquedano Estévez, Carlos, Cruz-Pérez, Noelia, Martínez León, Jorge, Laspidou, Chrysi, Santamarta, Juan C., García-Gil, Alejandro |
| المساهمون: | European Commission, Agencia Estatal de Investigación (España), Marazuela, Miguel Ángel, García Gil, Alejandro |
| بيانات النشر: | Elsevier |
| سنة النشر: | 2023 |
| المجموعة: | Digital.CSIC (Consejo Superior de Investigaciones Científicas / Spanish National Research Council) |
| مصطلحات موضوعية: | Volcanic dyke, Drinking water, Freshwater lens, Island aquifer, Numerical modeling, Seawater intrusion |
| الوصف: | [EN] Freshwater in coastal and island aquifers is a valuable resource whose availability is strongly conditioned by heterogeneity. More than 80 % of the Earth's surface is of volcanic origin, but the effect of volcanic dykes on the geometry of the saline interface that separates freshwater from seawater is still underexplored. This paper analyzes the impact of volcanic dykes on the depth of the saline interface in coastal and island aquifers and, subsequently, on the availability of fresh groundwater. Hydrogeological and hydrochemical data from a gallery, perpendicularly crossing several tens of dykes, were integrated with numerical modeling on the volcanic island of El Hierro (Canary Islands, Spain). Measured hydraulic heads demonstrated that the presence of dykes increased the hydraulic gradient by more than an order of magnitude, with respect to an adjacent area not affected by dykes. Numerical assessment confirmed that the lower the hydraulic conductivity of the dykes, the greater the depth of the saline interface inland. This impact led to fresh groundwater reserves increasing inland, relative to a hypothetical case without dykes. Numerical simulations also demonstrated that dykes can prevent salinization of production wells in coastal and island aquifers, if they are correctly located. Locating production wells far enough inland in an area affected by dykes allowed a higher freshwater extraction rate than if dykes did not exist; near the coastline, the effect tended to be the opposite. These results will be key to improving the management of fresh groundwater resources in coastal volcanic aquifers, and especially on volcanic islands such as the Hawaiian Islands or the Macaronesian archipelagos. ; This research was supported by the European Union's Horizon 2020 Research and Innovation Program (ARSINOE project, 101037424), and the Spanish Research Agency (SAGE4CAN project, PID2020-114218RA-100). ; Peer reviewed |
| نوع الوثيقة: | article in journal/newspaper |
| وصف الملف: | application/pdf |
| اللغة: | English |
| Relation: | #PLACEHOLDER_PARENT_METADATA_VALUE#; info:eu-repo/grantAgreement/EC/H2020//101037424; info:eu-repo/grantAgreement/AEI/Plan Estatal de Investigación Científica y Técnica y de Innovación 2017-2020/PID2020-114218RA-I00/ES/ENERGIA GEOTERMICA SOMERA PARA LAS ISLAS CANARIAS/; Publisher's version; https://doi.org/10.1016/j.scitotenv.2023.165638; Sí; Science of the Total Environment 899: 165638 (2023); http://hdl.handle.net/10261/360650 |
| DOI: | 10.1016/j.scitotenv.2023.165638 |
| الاتاحة: | http://hdl.handle.net/10261/360650 https://doi.org/10.1016/j.scitotenv.2023.165638 |
| Rights: | open |
| رقم الانضمام: | edsbas.A356B327 |
| قاعدة البيانات: | BASE |
| DOI: | 10.1016/j.scitotenv.2023.165638 |
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